webpack.config.js

const webpack = require('webpack');
const path = require('path');
const pkg = require('./package.json');

// variables
const isProduction = process.argv.indexOf('-p') >= 0 || process.env.NODE_ENV === 'production';
const sourcePath = path.join(__dirname, './src');
const outPath = path.join(__dirname, './build');

// plugins
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');

module.exports = {
  context: sourcePath,
  entry: {
    app: './index.ts'
  },
  output: {
    path: outPath,
    filename: isProduction ? '[contenthash].js' : '[hash].js',
    chunkFilename: isProduction ? '[name].[contenthash].js' : '[name].[hash].js'
  },
  target: 'web',
  resolve: {
    extensions: ['.js', '.ts'],
    // Fix webpack's default behavior to not load packages with jsnext:main module
    // (jsnext:main directs not usually distributable es6 format, but es6 sources)
    mainFields: ['module', 'browser', 'main'],
    alias: {
      app: path.resolve(__dirname, 'src/app/')
    }
  },
  module: {
    rules: [
      // .ts
      {
        test: /\.ts$/,
        use: ['ts-loader']
      },
      // css
      {
        test: /\.css$/,
        use: [
          isProduction ? MiniCssExtractPlugin.loader : 'style-loader',
          {
            loader: 'css-loader',
            query: {
              sourceMap: !isProduction,
              importLoaders: 1,
              modules: {
                localIdentName: isProduction ? '[hash:base64:5]' : '[local]__[hash:base64:5]'
              }
            }
          }
        ]
      },
      // static assets
      { test: /\.html$/, use: 'html-loader' },
      {
        test: /\.(jpe?g|png|gif|bmp|mp3|mp4|ogg|wav|eot|ttf|woff|woff2)$/,
        use: {
          loader: 'file-loader',
          options: {
            outputPath: 'assets'
          }
        }
      }
    ]
  },
  optimization: {
    splitChunks: {
      name: true,
      cacheGroups: {
        commons: {
          chunks: 'initial',
          minChunks: 2
        },
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          chunks: 'all',
          filename: isProduction ? 'vendor.[contenthash].js' : 'vendor.[hash].js',
          priority: -10
        }
      }
    },
    runtimeChunk: true
  },
  plugins: [
    new webpack.EnvironmentPlugin({
      NODE_ENV: 'development', // use 'development' unless process.env.NODE_ENV is defined
      DEBUG: false
    }),
    new CleanWebpackPlugin(),
    new MiniCssExtractPlugin({
      filename: '[hash].css',
      disable: !isProduction
    }),
    new HtmlWebpackPlugin({
      template: '../index.html',
      minify: {
        minifyJS: true,
        minifyCSS: true,
        removeComments: true,
        useShortDoctype: true,
        collapseWhitespace: true,
        collapseInlineTagWhitespace: true
      },
      append: {
        head: `<script src="https://cdn.polyfill.io/v3/polyfill.min.js"></script>`
      },
      meta: {
        title: pkg.name,
        description: pkg.description,
        keywords: Array.isArray(pkg.keywords) ? pkg.keywords.join(',') : undefined
      }
    })
  ],
  devServer: {
    contentBase: sourcePath,
    hot: true,
    inline: true,
    historyApiFallback: {
      disableDotRule: true
    },
    stats: 'minimal',
    clientLogLevel: 'warning'
  },
  // https://webpack.js.org/configuration/devtool/
  devtool: isProduction ? 'source-map' : 'cheap-module-source-map',
  node: {
    // workaround for webpack-dev-server issue
    // https://github.com/webpack/webpack-dev-server/issues/60#issuecomment-103411179
    fs: 'empty',
    net: 'empty'
  }
};